Toroidal core type actuator with phase separators

Abstract

To provide a toroidal core type actuator having a stator unit which is increased in winding density, is improved in methods of the terminal handling after winding, the positioning of the stator after winding, and the fixing of the same, and is excellent in working properties. A toroidal core type actuator having a stator and a rotor is provided, the stator having winding applied to a hollow cylindrical core composed of soft magnetic material, the rotor including a permanent magnet having north poles and south poles alternately arranged in total of m along the circumferential direction thereof, the rotor being rotatably arranged in the core of the stator via a minute air gap, wherein m of phase separators composed of non-magnetic material are arranged on the peripheral surface of the hollow cylindrical core so as to be separated from each other by 360°/m and the winding is applied to winding regions separated from each other by the phase separators.

What is claimed is:  
     
         1 . A toroidal core type actuator comprising a stator and a rotor, said stator having winding applied to a hollow cylindrical core composed of soft magnetic material, said rotor including a permanent magnet having north poles and south poles alternately arranged in total of m along the circumferential direction thereof, said rotor being rotatably arranged in said core of said stator via a minute air gap, wherein: 
 m of phase separators composed of non-magnetic material are arranged on a peripheral surface of said hollow cylindrical core so as to be separated from each other by 360°/m; and    a coil is wound on winding regions separated from each other by said phase separators.    
     
     
         2 . The toroidal core type actuator according to    claim 1   , wherein said phase separators are composed of insulating resin.  
     
     
         3 . The toroidal core type actuator according to    claim 1   , wherein said m of phase separators arranged on said hollow cylindrical core are identical to each other in dimension at radial innermost portions thereof and said dimension is set to be smaller than a radial innermost dimension of the coil wound on said core.  
     
     
         4 . The toroidal core type actuator according to    claim 3   , wherein said m of phase separators arranged on said hollow cylindrical core are identical to each other in dimension at outermost radial portions thereof and said dimension is set to be greater than an outermost radial dimension of the coil wound on said core.  
     
     
         5 . The toroidal core type actuator according to    claim 2   , wherein an insulating portion for providing electrical insulation between said core and said coil is integrally provided on said phase separators.  
     
     
         6 . The toroidal core type actuator according to    claim 2   , wherein at least one of said phase separators is provided with one or more coil binding terminals.  
     
     
         7 . The toroidal core type actuator according to    claim 1   , wherein said core is constituted by rolling a soft magnetic thin strip of uniform width into a roll shape.  
     
     
         8 . The toroidal core type actuator according to    claim 7   , wherein said soft magnetic thin strip of roll shape has a tapered portion sequentially and successively increasing its width from an innermost peripheral end thereof at a start of the roll.  
     
     
         9 . The toroidal core type actuator according to    claim 8   , wherein said tapered portion extends for approximately one turn along the innermost periphery of said core.  
     
     
         10 . The toroidal core type actuator according to    claim 9   , wherein said hollow cylindrical core is constituted by preparing pipe-shaped soft magnetic material as a rolling core, and winding on said rolling core said soft magnetic thin strip of uniform width into a roll shape.